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  <h1 class="title">简介</h1>
  <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此扩展在 Windows 平台上不可用。</span></p></blockquote>
  <p class="para">
   This module provides an additional session save handler for the
   <a href="book.session.html" class="link">session</a>
   module using <a href="http://www.postgresql.org/" class="link external">&raquo;&nbsp;PostgreSQL</a> as a
   storage system. A <em>user-level</em> session storage function may
   also be used - <span class="function"><a href="function.session-set-save-handler.html" class="function">session_set_save_handler()</a></span>, but this module is
   written in C and therefore could be twice as fast, compared to
   a session save handler written in PHP.
  </p>
  <p class="para">
   Session PgSQL is designed to scale any size of web sites and offers some
   advanced features:
   <ul class="simplelist">
    <li class="member">session tables are created automatically</li>
    <li class="member">automatic session table vacuum</li>
    <li class="member">better garbage collection</li>
    <li class="member">multiple PostgreSQL servers support</li>
    <li class="member">automatic database server failover (switching)</li>
    <li class="member">
     automatic database server load balancing if there are multiple
     PostgreSQL servers.
    </li>
    <li class="member">short circuit UPDATE</li>
   </ul> 
  </p>
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